What does the Buddha mean by pointing?

One finger points to the sky and one finger points to the ground, indicating that heaven and earth are unique. Everyone has a perfect Buddha nature. He is the source of all things in the world. He is everything, everything is him. This Buddha nature is shared by all living beings, and nothing can be higher than it, so it is called the dominance of heaven and earth. Here I mean Buddha nature, and everyone has such Buddha nature.